Mine water underground collaborative hardness removal treatment system and method

Abstract

The invention relates to a mine water underground synergistic hardness removal treatment system and method.The system comprises an underground reservoir and a chemical adding unit, suspended solids and hardness ions in mine water can be synergistically removed through underground space, and the overall efficiency and the purification effect of mine water treatment are effectively improved; the method is beneficial to reducing the use amount of chemical agents, reducing the treatment cost, avoiding equipment blockage and scaling risks caused by agent residues and too hard water quality, prolonging the service life of the system, reducing the sludge treatment requirement and reducing the environmental burden, purified water obtained after treatment can meet the requirements of production, dust fall, fire fighting water and the like, and the method is suitable for popularization and application. The recycling rate of water resources is obviously improved, and the method has a wide application prospect.

Description

Technical Field

[0001] The present invention relates to a system and method for underground coordinated hardness removal treatment of mine water. Background Art

[0002] Mine water is mainly composed of groundwater and formation water that enters the tunnel during coal mining. It usually contains a large amount of suspended matter (including coal powder, rock powder and other particulate impurities) and hardness ions (mainly calcium and magnesium ions). With the increasing requirements for water resource utilization, the recycling of mine water has gradually become an important part of coal mine production. Existing mine water treatment methods mainly rely on ground treatment systems, which usually include two steps: suspended matter removal and hardness treatment. They are achieved through processes such as sedimentation, filtration, flocculation, and softening with chemicals. They have shortcomings such as complex processes, high costs, long sedimentation times, large floor space, and high reagent consumption. For example, the existing ground treatment system requires the construction of a special pumping station to pump mine water to the ground, which has significant lifting costs and can easily induce geological disasters such as ground subsidence and collapse, seriously damaging the ecological environment. In order to ensure the sedimentation effect, actual engineering applications often excessively add flocculants, coagulants and other chemical agents, which can easily cause residual film fouling, affect the system's patency and stability, and increase maintenance costs. If the hardness is not removed sufficiently, hard scale will clog the pipes and equipment, and the effluent quality will be difficult to meet the reuse water standards. In addition, the sludge formed after ground treatment sedimentation usually has a high moisture content and still requires further concentration and dehydration treatment, which increases the difficulty of subsequent treatment. Summary of the invention

[0003] The purpose of the present disclosure is to provide a system and method for underground coordinated hardness removal of mine water.

[0004] In order to achieve the above-mentioned object, the present disclosure provides, in a first aspect, a system for underground coordinated hardness removal treatment of mine water, the system comprising an underground water reservoir and a dosing unit; The underground water reservoir is used to receive mine water containing suspended matter, so that the mine water undergoes a suspended matter collaborative hardness removal reaction under a pH value of 9.5 to 10.5 to obtain purified water after the suspended matter and hardness ions are removed; The dosing unit is used to provide a hardness remover to the mine water.

[0005] Optionally, the mineralization of the mine water is 1000-20000 mg / L, the turbidity is 0-10000 NTU, and the CaCO 3 The hardness of the meter is 0~2000 mg / L.

[0006] Optionally, the dosing unit includes a pre-reservoir dosing unit and / or an in-reservoir dosing unit, the pre-reservoir dosing unit is used to provide the de-hardening agent before the mine water enters the underground reservoir, and the in-reservoir dosing unit is used to provide the de-hardening agent to the mine water in the underground reservoir.

[0007] Optionally, the pre-storage drug adding unit includes a drug dispensing subunit, a drug storage subunit and a drug adding and mixing subunit; The dispensing subunit is used to prepare the de-hardening agent according to the water quality parameters of the mine water; The medicine storage subunit is used for temporarily storing the de-hardening agent; The dosing and mixing subunit is used to provide the hardness remover for thorough mixing with the mine water.

[0008] Optionally, the dosing and mixing subunit is equipped with a pH value monitoring device and an automatic dosing controller; The pH value monitoring device is used to monitor the pH value of the mine water in the dosing and mixing subunit in real time; The automatic dosing controller is connected to the pH value monitoring device and is used to automatically adjust the dosage of the de-hardening agent according to the pH value of the mine water to ensure that the pH value of the mine water remains within a preset range.

[0009] Optionally, the underground water reservoir comprises a plurality of water reservoir sub-units connected in series, and the plurality of water reservoir sub-units are respectively connected to the dosing unit in the reservoir; Each of the reservoir subunits provides a seepage path of no less than 20 m along the water flow direction, and is respectively equipped with a pH value monitoring device, a turbidity monitoring device and a hardness monitoring device.

[0010] Optionally, the water reservoir subunit is provided with a plurality of evenly distributed dosing points, the dosing unit in the reservoir comprises a plurality of dosing subunits connected to the dosing points in a one-to-one correspondence, and the dosing subunits are used to provide the de-hardening agent to the mine water in the water reservoir subunit through the dosing points; Preferably, the dosing subunit is equipped with an automatic dosing controller for automatically adjusting the dosage of the de-hardening agent according to the water quality of the mine water corresponding to the reservoir subunit.

[0011] Optionally, the mineralization of the purified water is 1000-20000 mg / L, the turbidity is <20 NTU, and the CaCO 3 The hardness of the water is 0~100 mg / L and the pH value is 9.5~10.5.

[0012] In a second aspect of the present disclosure, a method for treating mine water using the system described in the first aspect of the present disclosure is provided, the method comprising: The mine water containing suspended matter is allowed to enter the underground reservoir, and a de-hardening agent is provided to the mine water in the underground reservoir through a dosing unit, so that the mine water undergoes a suspended matter synergistic de-hardening reaction under a pH value of 9.5-10.5, thereby obtaining purified water after the suspended matter and hardness ions are removed.

[0013] Optionally, the residence time of the mine water in the underground reservoir is 4 hours to 60 days.

[0014] Through the above-mentioned technical scheme, the present invention utilizes the underground space to achieve the coordinated removal of suspended matter and hardness ions in mine water, effectively improving the overall efficiency and purification effect of mine water treatment, which is beneficial to reduce the use of chemical agents and reduce treatment costs, avoid the risk of equipment blockage and scaling caused by agent residues and excessively hard water quality, extend the service life of the system, and also help reduce sludge treatment needs and reduce environmental burdens. The purified water obtained after treatment can meet the needs of production, dust reduction and fire fighting water, significantly improves the water resource reuse rate, and has broad application prospects.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 The present invention is a schematic diagram of the structure and flow of an underground mine water treatment system according to a specific implementation method.

[0017] Figure 2 The present invention is a structural schematic diagram of an underground mine water treatment system according to a specific implementation method.

[0018] Figure 3 These are electron microscope comparison photos of the hard scale particles in Example 1 and Comparative Example 1.

[0019] Figure 4 This is the hardness of the purified water outlet of Example 1.

[0020] Description of Reference Numerals 1—dosing unit before the reservoir, 11—dosing point before the reservoir, 2—underground reservoir, 21—reservoir subunit, 22—dosing point in the reservoir, 3—dosing unit in the reservoir, 31—dosing subunit, 4—mine water, 5—purified water, 6—stratum. DETAILED DESCRIPTION

[0021] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0022] In a first aspect of the present disclosure, a system for synergistically removing hardness from underground mine water is provided, the system comprising an underground water reservoir and a dosing unit; wherein the underground water reservoir is used to receive mine water containing suspended matter, so that the mine water undergoes a synergistic hardness removal reaction of suspended matter under a pH value of 9.5 to 10.5 to obtain purified water after the suspended matter and hardness ions are removed; the dosing unit is used to provide a de-hardness agent to the mine water.

[0023] In order to solve the problems of complex existing mine water treatment processes, high costs, long sedimentation time, large floor space, and high reagent consumption, the present invention proposes an underground collaborative hardness removal system for mine water containing suspended matter, which fully utilizes the underground space to achieve on-site treatment of mine water, utilizes the existing suspended matter resources in the mine water as crystal nuclei, promotes the precipitation of hardness ions (i.e., calcium and magnesium ions) more quickly, effectively reduces the amount of reagents used and the treatment cost, improves the treatment efficiency and purification effect, and the purified water obtained after treatment can be directly reused in underground production, dust reduction, fire fighting, etc. The present disclosure is particularly suitable for the water quality with high suspended matter and hardness content in mine water. Specifically, the suspended matter content of the mine water can be 0-10000 mg / L, preferably 0-5000 mg / L; the mineralization degree can be 1000-20000 mg / L, preferably 1000-10000 mg / L, more preferably 1000-6000 mg / L; the turbidity can be 0-10000 NTU, preferably 0-5000 NTU; the CaCO 3 The hardness of the mine water can be 0-2000 mg / L, preferably 0-1000 mg / L; further, in the mine water, the particle size of the suspended matter can be 0.1-100 μm, preferably 0.5-50 μm.

[0024] In one embodiment, the dosing unit may include a pre-reservoir dosing unit and / or an in-reservoir dosing unit to flexibly adapt to different water quality conditions and treatment requirements of mine water. Among them, the pre-reservoir dosing unit is used to provide the de-hardening agent before the mine water enters the underground reservoir, and the in-reservoir dosing unit is used to provide the de-hardening agent to the mine water in the underground reservoir. The pre-reservoir dosing unit and the in-reservoir dosing unit can be used alone or at the same time, and work together according to the treatment objectives and site conditions. For example, when the hardness of the mine water is low and the treatment load is small, only the pre-reservoir dosing unit can be used; when the hardness of the mine water is high and the reaction time is sufficient, only the in-reservoir dosing unit can be used; when the hardness of the mine water is high and the flow rate fluctuates greatly, it is preferred to use the pre-reservoir dosing unit to initially reduce the hardness, and then supplement the dosing in the underground reservoir to ensure the treatment effect.

[0025] In a preferred embodiment, reference Figure 1 , the system comprises: The pre-storage dosing unit 1 is used to receive the mine water 4 containing suspended matter and provide a de-hardening agent to the mine water so that the pH value of the mine water is 9.5-10.5; The underground water reservoir 2 is used to receive the mine water from the pre-reservoir dosing unit 1, so that the mine water undergoes a suspended solids synergistic hardness removal reaction under a pH value of 9.5 to 10.5, thereby obtaining purified water 5 after the suspended solids and hardness ions are removed; The dosing unit 3 in the reservoir is used to provide a hardness remover to the mine water in the underground water reservoir 2 .

[0026] According to the present disclosure, the mine water can come from multiple water gushing points located in different ore layers or regions underground, and the mine water from different water gushing points may have different water qualities. In a specific embodiment, the system may also include a pre-sinking water tank, which is connected to the upstream of the pre-storage dosing unit 1 and is used to homogenize and pre-sink the mine water from multiple water gushing points, so that the mine water can achieve a more uniform water quality before entering the pre-storage dosing unit 1, while reducing the content of large suspended particles in the mine water and reducing the solid load in the subsequent treatment stage. The pre-sinking water tank can be located in the initial collection area of ​​the mine water, and its capacity can be 200~8000 m 3 The pre-sinking water tank can be connected to the water inlet of the pre-sink dosing unit 1 through a water pipeline, and a conveying device can be configured on the pipeline to convey the mine water from the pre-sinking water tank to the pre-sink dosing unit 1.

[0027] The pre-storage dosing unit 1 provides preliminary hardness removal agent addition and mixing treatment for mine water containing suspended matter. By adjusting water quality conditions, the suspended matter in the mine water provides an attachment surface for the precipitation of hardness ions such as calcium and magnesium. These suspended particles can serve as crystal nuclei, prompting calcium and magnesium ions to precipitate faster to form copolymers of low-solubility stable crystals such as calcium carbonate and magnesium hydroxide and suspended matter.

[0028] In a specific embodiment, the pre-storage dosing unit 1 may include a dosing subunit, a storage subunit and a dosing mixing subunit. The dosing subunit is used to prepare the de-hardening agent according to the water quality parameters of the mine water. The water quality parameters may include at least one of turbidity, hardness and alkalinity. The dosing subunit may be connected to the water quality monitoring device of the underground water reservoir 2. When the mine water quality is monitored to have a high suspended matter content, the concentration of the de-hardening agent may be prepared to a relatively low level. When the suspended matter content is low, the concentration of the de-hardening agent is automatically increased. The storage subunit is used to temporarily store the de-hardening agent to ensure the continuity of the supply of the de-hardening agent. The storage subunit may be equipped with a liquid level sensor to monitor the stock of the de-hardening agent in real time so as to trigger replenishment when the de-hardening agent content is insufficient. The storage subunit may be connected to the dosing mixing subunit via a metering pump or a control valve. The dosing and mixing subunit is used to provide the de-hardening agent and the mine water for thorough mixing, and can be arranged on the water inlet pipe for the mine water to enter the underground reservoir 2, and can be provided with a stirring component to enhance the mixing effect through mechanical or pneumatic stirring.

[0029] Furthermore, the dosing and mixing subunit can also be configured with a pH value monitoring device and an automatic dosing controller, wherein the pH value monitoring device is used to monitor the pH value of the mine water in the dosing and mixing subunit in real time, and the automatic dosing controller is connected to the pH value monitoring device, and is used to automatically adjust the dosage of the de-hardening agent according to the pH value of the mine water to ensure that the pH value of the mine water remains within a preset range, thereby forming a closed-loop control, quickly responding to pH fluctuations of the mine water, avoiding insufficient or excessive dosage due to changes in water quality, and realizing the intelligent and dynamic operation of the pre-reservoir dosing unit 1. The water outlet of the dosing and mixing subunit is connected to the water inlet of the underground reservoir 2 through a water pipeline, and a conveying device can be configured on the pipeline to convey the mine water from the pre-reservoir dosing unit 1 to the underground reservoir 2.

[0030] The underground water reservoir 2 can be located downstream of the pre-reservoir dosing unit 1, which refers to a water storage space located in the stratum, for receiving mine water that has been mixed with a hardness remover, and completing the coordinated sedimentation and purification of suspended matter and hardness ions underground. Specifically, under suitable alkaline environment and water quality conditions, hardness ions are prone to precipitation reaction. When calcium and magnesium ions form precipitation on the surface of suspended matter particles, the specific gravity of these particles themselves increases, making it easier to settle under gravity, achieving the simultaneous removal of suspended matter and hardness ions in mine water, and obtaining purified water after removing suspended matter and hardness ions. This coordinated sedimentation effect greatly improves the hardness removal and purification effect, reduces the residual of suspended matter and hardness ions in the water body, and, because the suspended matter particles act as carriers and reaction promoters in the coordinated hardness removal process, the precipitation reaction of hardness ions is accelerated, and the demand for hardness removers in the system is relatively reduced, avoiding the risk of equipment blockage and scaling caused by residual agents and too hard water quality, reducing the operating cost of the system, and extending the service life of the system. The sludge formed by the precipitation of hardness ions and suspended particles can remain in the underground reservoir 2, avoiding the additional processing burden of sludge transportation or surface treatment and the adverse impact on the environment.

[0031] The capacity of the underground reservoir 2 can be 100,000 to 5,000,000 cubic meters, which can provide sufficient residence time for the mine water. In a specific embodiment, the underground reservoir 2 can be a mined-out area underground, which refers to the space or cavity left underground after the ore body is mined, and has natural sedimentation, filtration and water storage capabilities.

[0032] The underground reservoir 2 can be designed as a one-stage or multi-stage series structure. Figure 2 As shown, the underground reservoir 2 includes a plurality of reservoir subunits 21 connected in series in the stratum 6, and the plurality of reservoir subunits 21 are connected in sequence through pipelines ( Figure 2 (not shown), and multiple reservoir subunits 21 are respectively connected to the dosing unit 3 in the reservoir. Furthermore, each of the reservoir subunits 21 provides a seepage path of not less than 20m along the water flow direction to ensure that the mine water has sufficient residence time, and is respectively equipped with a water quality monitoring device, which may specifically include a pH value monitoring device, a turbidity monitoring device and a hardness monitoring device, which are used to monitor the key water quality parameters of the mine water in real time. According to these parameters, the dosage of the de-hardening agent can be adjusted in real time to ensure the effectiveness of the suspended matter synergistic de-hardening reaction. The reservoir subunit 21 can be provided with multiple evenly distributed dosing points for the addition of the de-hardening agent.

[0033] The in-reservoir dosing unit 3 can accurately add a de-hardening agent to the mine water in the underground water reservoir 2. In a specific embodiment, the in-reservoir dosing unit 3 may include a drug dispensing subunit, a drug storage subunit, and a plurality of dosing subunits 31 similar to those in the pre-reservoir dosing unit 1. The dosing subunits 31 are connected to the dosing points set in the underground water reservoir 2 (or the reservoir subunit 21) one by one, and provide the de-hardening agent to the mine water in the underground water reservoir 2 (or the reservoir subunit 21) through the dosing points. Furthermore, the dosing subunit 31 is equipped with an automatic dosing controller for automatically adjusting the dosage of the de-hardening agent according to the water quality (including pH value, hardness, turbidity, etc.) of the mine water in the corresponding reservoir subunit 21.

[0034] In the present disclosure, the hardness remover may be an alkaline agent, for example, Na 2 CO 3 At least one of NaOH, lime and gypsum. The de-hardening agent provided by the pre-storage dosing unit and the in-storage dosing unit may be the same or different.

[0035] In one embodiment, the underground collaborative hardness removal treatment system for mine water disclosed in the present invention further includes a control module for intelligently monitoring and regulating each key unit and treatment parameter in the mine water treatment process. The control module is connected between key equipment such as the pre-sinking tank, the pre-storage dosing unit, the underground water reservoir, and the in-storage dosing unit, and realizes the automated management and optimization of the entire mine water treatment system by integrating functions such as water quality monitoring, agent addition, and pH value adjustment. In a preferred embodiment, the control module adopts an adaptive control algorithm based on artificial intelligence, which can gradually optimize the control parameters of each node (such as the amount of hardness removal agent added, etc.) during operation, and form historical data records to facilitate subsequent analysis and system optimization.

[0036] The underground coordinated hardness removal treatment system for mine water disclosed in the present invention is suitable for large-scale continuous treatment of mine water. Specifically, the system treatment scale can reach 10~10000t / h. After treatment, most of the carbonate hardness in the mine water can be removed, and the effluent can be directly reused in the water use point or post-treatment unit. Specifically, the suspended matter content of the purified water can be 0~50 mg / L, preferably 0~20 mg / L; the mineralization can be 1000~20000 mg / L, preferably 1000~10000 mg / L; the turbidity can be <20 NTU; with CaCO 3 The hardness of the meter can be 0-100 mg / L, preferably 5-50 mg / L; the pH value can be 9.5-10.5.

[0037] The present invention realizes the rational utilization of underground space resources. There is no need to lift mine water from underground to the ground for treatment, which reduces the construction and operation costs of a large number of lifting pump stations and the occupation of ground resources. The hardness and suspended matter in the mine water can be removed synergistically without the addition of coagulants and coagulant aids. It is also beneficial to reduce the demand for sludge management and improve environmental protection benefits. The treated purified water can meet the needs of production, dust reduction and fire fighting water, greatly improving the water resource reuse rate. The entire treatment system can operate for a long time, efficiently and stably, and is more economical and energy-saving. It has the advantages of systematicity, source control, simple structure, flexible application, low cost, strong practicality, high control efficiency and good control effect.

[0038] In a second aspect of the present disclosure, a method for treating mine water using the system described in the first aspect of the present disclosure is provided, the method comprising: The mine water containing suspended matter is allowed to enter the underground reservoir, and a de-hardening agent is provided to the mine water in the underground reservoir through a dosing unit, so that the mine water undergoes a suspended matter synergistic de-hardening reaction under a pH value of 9.5-10.5, thereby obtaining purified water after the suspended matter and hardness ions are removed.

[0039] In the embodiment in which the dosing unit includes a pre-storage dosing unit and an in-storage dosing unit, the method may include the following steps S101-S102: S101, mixing the mine water containing suspended matter with a de-hardening agent in a pre-storage dosing unit to make the pH value of the mine water 9.5-10.5; The method may further include: homogenizing and pre-precipitating the mine water from multiple water gushing points in a pre-precipitation tank, and then entering the pre-storage dosing unit. The suspended solids content of the mine water may be 0-10000 mg / L, preferably 0-5000 mg / L; the mineralization degree may be 1000-20000 mg / L, preferably 1000-10000 mg / L; the turbidity may be 0-10000 NTU, preferably 0-5000 NTU; and the CaCO 3 The hardness of the mine water can be 0-2000 mg / L, preferably 0-1000 mg / L; the amount of the de-hardening agent can be adjusted according to the total amount / water quality of the mine water and the type of the de-hardening agent. Specifically, based on 100 parts by weight of the mine water, the amount of the de-hardening agent can be 0.005-0.2 parts by weight. Furthermore, the method can also include: monitoring the pH value of the mine water, and automatically adjusting the dosage of the de-hardening agent according to the pH value of the mine water.

[0040] S102, allowing the mine water from the pre-reservoir dosing unit to enter the underground reservoir, and providing a de-hardening agent to the mine water in the underground reservoir through the in-reservoir dosing unit, so that the mine water undergoes a suspended matter synergistic hardness removal reaction under a pH value of 9.5-10.5, and obtains purified water after the suspended matter and hardness ions are removed.

[0041] Wherein, the residence time of the mine water in the underground reservoir is 4h to 60 days. The dosage of the de-hardening agent can be adjusted according to the total amount / water quality of the mine water and the type of the de-hardening agent. Specifically, based on 100 parts by weight of the mine water, the dosage of the de-hardening agent can be 0.005~0.2 parts by weight. Furthermore, the method may also include: monitoring the pH value, turbidity and hardness of the mine water, and automatically adjusting the dosage of the de-hardening agent according to the water quality of the mine water. The suspended matter content of the purified water can be 0~50 mg / L, preferably 0~20 mg / L; the mineralization can be 1000~20000 mg / L, preferably 1000~10000 mg / L; the turbidity can be <20 NTU; with CaCO 3 The hardness of the meter can be 0-100 mg / L, preferably 5-50 mg / L; the pH value can be 9.5-10.5.

[0042] The method described in the second aspect of the present disclosure has all the beneficial effects of the system described in the first aspect of the present disclosure, which will not be repeated here.

[0043] The present disclosure is further illustrated by the following examples, but is not intended to limit the present disclosure.

[0044] Example 1 Deployed in a mining area Figure 1 and Figure 2 The system shown is for mine water treatment and specifically includes: The pre-sink receives mine water from multiple water inflow points for homogenization and pre-sinking. The initial mineralization of the mine water is about 4000 mg / L, the turbidity is about 260 NTU, and the CaCO 3 The hardness of the water is about 310 mg / L, and the average particle size of the suspended matter is 8.098 μm.

[0045] The mine water in the pre-sinking tank enters the pre-storage dosing unit, and the de-hardening agent lime is prepared into a solution with a concentration of 5% by weight, and is added from the pre-storage dosing point 11 through the automatic dosing controller to adjust the pH value of the mine water to 10.

[0046] The mine water from the pre-reservoir dosing unit enters the underground reservoir (pilot scale). The total volume of the underground reservoir is 230,000 cubic meters, the total length of the seepage path along the water flow direction is 34.2m, the mine water residence time is 4.025 days, and it is equipped with pH, ​​turbidity and hardness monitoring devices.

[0047] In the library, the dosing unit will remove the hardness agent Na 2 CO 3 A solution with a concentration of 10% by weight is prepared and added from multiple dosing points 22 in underground water reservoirs through the dosing subunit 31. The dosage of the de-hardening agent is dynamically adjusted according to the water quality monitoring data to adjust the pH value of the mine water to 10.

[0048] Purified water was collected from underground reservoirs after the suspended solids and hardness ions were removed. The mineralization was 4000 mg / L, the turbidity was 16 NTU, and the CaCO 3 The hardness of the meter is 32mg / L, the pH value is 10, and the water quality meets the Class III standard of the "Surface Water Environmental Quality Standard" (GB20246-2006). It is supplied to underground production and ground use through the water purification pool. The hard scale particles formed by the precipitation of hardness ions in the underground reservoir are collected, filtered and dried, and their morphology is observed by SEM electron microscope. Figure 3 , it can be seen that the hard scale particles are CaCO 3 The aggregation (c) and encapsulation (d) morphologies of the crystalline and amorphous suspensions, and their specific surface area, average particle size, median particle size, 10% particle size and 90% particle size are tested and are listed in Table 1.

[0049] The hardness of the water discharged from the underground mine water treatment system of this embodiment after running for 168 hours is as follows: Figure 4 As shown, it can be seen that a good hardness removal effect can be maintained in long-term operation. The processing scale is 2t / h and the average hardness removal rate is 89.67%.

[0050] Comparative Example 1 The mine water was treated according to the method of Example 1, except that clarified mine water was used for treatment, i.e., the mine water did not contain suspended matter, had an initial mineralization of 4000 mg / L, a turbidity of 9 NTU, and CaCO 3 The hardness of the meter is 310 mg / L.

[0051] In this comparative example, the mineralization of the underground reservoir water is 4000 mg / L, the turbidity is 9 NTU, and the CaCO 3 The hardness of the hardness ion in the underground reservoir was 41 mg / L and the pH value was 10. The hard scale particles formed by the precipitation of hardness ions in the underground reservoir were collected, filtered and dried, and their morphology was observed by SEM electron microscope. Figure 3 It can be seen that the hard scale particles are basically regular cubic CaCO 3 The specific surface area, average particle size, median particle size, 10% particle size and 90% particle size of the crystal forms (a) and (b) are tested and listed in Table 1. The average hardness removal rate of this comparative example is 86.7%.

[0052] Comparative Example 2 The mine water was treated according to the method of Example 1, except that no de-hardening agent was added.

[0053] In this comparative example, the mineralization of the underground reservoir water is 4000 mg / L, the turbidity is 260 NTU, and the CaCO 3 The hardness of the meter is 310 mg / L and the pH value is 7.8. The suspended particles in the underground reservoir were collected, filtered and dried, and their specific surface area, average particle size, median particle size, 10% particle size and 90% particle size were tested, which are listed in Table 1.

[0054] Comparative Example 3 The mine water was treated according to the method of Example 1, except that the pH value of the mine water in the pre-reservoir dosing unit and the underground reservoir was adjusted to 9.

[0055] In this comparative example, the mineralization of the underground reservoir water is 4000 mg / L, the turbidity is 16 NTU, and the CaCO 3 The hardness of the meter is 87 mg / L, the pH value is 9, and the average hardness removal rate is 72%.

[0056] Table 1

[0057] As can be seen from Table 1, the hard scale particles of Example 1 have significantly improved particle size, indicating a more excellent suspended matter synergistic hardness removal treatment effect.

[0058] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0059] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0060] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A mine water underground collaborative hardness removal treatment system, characterized in that: The system includes an underground water reservoir and a dosing unit; The underground water reservoir is used to receive mine water containing suspended matter, so that the mine water undergoes a suspended matter collaborative hardness removal reaction under a pH value of 9.5 to 10.5 to obtain purified water after the suspended matter and hardness ions are removed; The dosing unit is used to provide a hardness remover to the mine water.

2. The system according to claim 1, wherein: The mineralization of the mine water is 1000~20000 mg / L, the turbidity is 0~10000 NTU, and the total hardness in terms of CaCO3 is 0~2000 mg / L.

3. The system according to claim 1, wherein: The dosing unit includes a pre-reservoir dosing unit and / or an in-reservoir dosing unit. The pre-reservoir dosing unit is used to provide the de-hardening agent before the mine water enters the underground reservoir, and the in-reservoir dosing unit is used to provide the de-hardening agent to the mine water in the underground reservoir.

4. The system according to claim 3, wherein: The pre-storage drug adding unit includes a drug dispensing subunit, a drug storage subunit and a drug adding and mixing subunit; The dispensing subunit is used to prepare the de-hardening agent according to the water quality parameters of the mine water; The medicine storage subunit is used for temporarily storing the de-hardening agent; The dosing and mixing subunit is used to provide the hardness remover for thorough mixing with the mine water.

5. The system according to claim 4, wherein: The dosing and mixing subunit is equipped with a pH value monitoring device and an automatic dosing controller; The pH value monitoring device is used to monitor the pH value of the mine water in the dosing and mixing subunit in real time; The automatic dosing controller is connected to the pH value monitoring device and is used to automatically adjust the dosage of the de-hardening agent according to the pH value of the mine water to ensure that the pH value of the mine water remains within a preset range.

6. The system according to claim 3, wherein: The underground water reservoir comprises a plurality of water reservoir sub-units connected in series, and the plurality of water reservoir sub-units are respectively connected to the dosing unit in the reservoir; Each of the reservoir subunits provides a seepage path of no less than 20 m along the water flow direction, and is respectively equipped with a pH value monitoring device, a turbidity monitoring device and a hardness monitoring device.

7. The system according to claim 6, wherein: The water reservoir subunit is provided with a plurality of evenly distributed dosing points, the dosing unit in the reservoir comprises a plurality of dosing subunits connected to the dosing points in a one-to-one correspondence, the dosing subunits being used to provide the de-hardening agent to the mine water in the water reservoir subunit through the dosing points; Preferably, the dosing subunit is equipped with an automatic dosing controller for automatically adjusting the dosage of the de-hardening agent according to the water quality of the mine water corresponding to the reservoir subunit.

8. The system according to claim 1, wherein: The mineralization of the purified water is 1000-20000 mg / L, the turbidity is <20 NTU, the hardness in terms of CaCO3 is 0-100 mg / L, and the pH value is 9.5-10.

5.

9. A method for treating mine water using the system according to any one of claims 1 to 8, characterized in that: The method includes: The mine water containing suspended matter is allowed to enter the underground reservoir, and a de-hardening agent is provided to the mine water in the underground reservoir through a dosing unit, so that the mine water undergoes a suspended matter synergistic de-hardening reaction under a pH value of 9.5-10.5, thereby obtaining purified water after the suspended matter and hardness ions are removed.

10. The method according to claim 9, wherein: The residence time of the mine water in the underground reservoir is 4 hours to 60 days.

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